Update speakers.md (#126)
Update speakers.md (#126)

I noticed the links to speakers for other years were broken, so fixed it by having them direct out of the 2019 folder first
bangbangcon/bangbangcon.github.io,bangbangcon/bangbangcon.github.io,bangbangcon/bangbangcon.github.io,bangbangcon/bangbangcon.github.io,bangbangcon/bangbangcon.github.io,hausdorff/bangbangcon.github.io,hausdorff/bangbangcon.github.io,bangbangcon/bangbangcon.github.io,hausdorff/bangbangcon.github.io,bangbangcon/bangbangcon.github.io